The CDC says gum disease can make diabetes harder to manage, and that treating gum disease may help lower blood sugar over time; the conditional is the CDC's own.1 The relationship runs both ways: diabetes also raises the risk of developing gum disease, and of it progressing once it starts.2
What does the CDC say about the two?
The CDC states that gum disease can make diabetes harder to manage, and that treating gum disease may help lower blood sugar over time.1
Read that second clause slowly, because the word may is not filler. It's the CDC's own conditional, and it's there for a reason: the research supports a meaningful and repeatedly observed effect, but not a guarantee for any individual person. We're going to keep that conditional intact throughout this article, even where a firmer version would read better.
How does the link run in both directions?
Diabetes raises the risk of gum disease. This direction is the better established of the two, and it's why diabetes appears on essentially every clinical list of periodontal risk factors. Elevated blood sugar affects how the body responds to infection and how well tissue heals, including the gum tissue that is already fighting a persistent bacterial load. People with diabetes are more likely to develop gum disease, and more likely to have it progress once it starts.2
Gum disease appears to make diabetes harder to manage. This is the direction the CDC describes.1 The proposed mechanism is inflammation: gum disease is a chronic inflammatory condition, and chronic inflammation is understood to interfere with how the body uses insulin. An untreated inflammatory infection in the mouth adds to the total inflammatory burden a person with diabetes is already managing.
Each condition appears to make the other worse, which also means that addressing either one may help on both fronts.
That loop is why dental and medical teams increasingly treat these as related problems rather than separate ones. If you want the underlying anatomy of how inflammation in the mouth reaches the rest of the body, it's laid out in the mouth–body overview.
Does treating gum disease lower medical costs?
In insurance claims data, treating gum disease has been associated with substantially lower annual medical costs for members with diabetes: an association, and the most striking figure in this area. A peer-reviewed study in the American Journal of Preventive Medicine, covering over 330,000 insured members, found that treating gum disease was associated with about a 40% reduction in annual medical costs for members with diabetes.3
That number deserves three caveats stated up front rather than buried, because without them it's easy to misread.
First, it's an association. The study is retrospective and observational: it compares members who received periodontal treatment against members who didn't. It cannot establish that the treatment caused the lower costs. People who show up for periodontal treatment may also be people who show up for their endocrinology appointments, take their medication, and manage their condition more consistently overall. That's a real alternative explanation and the study design can't rule it out.
Second, it's claims data, not clinical outcomes. What was measured is dollars billed to an insurer, not blood sugar readings or complication rates. Lower medical spending is a meaningful signal, but it's a proxy for health, not a direct measure of it.
Third (and this is the caveat most often dropped), it's about professional periodontal treatment, not home flossing. The members in that study received scaling, root planing, and other clinical care from a dental professional. Nothing in the study tested a toothbrush or a floss container. Anyone citing this figure to sell you a home care product has skipped a step that the study itself never took.
What the finding does support is that gum disease in people with diabetes is worth treating, and that the health system has measurable reason to care. We look at that economic thread in more detail in treating gum disease and medical costs.
What should you do if you have diabetes?
Get your gums checked, and say the word "diabetes" out loud. Your dental team will treat you differently if they know: more attentive screening, potentially more frequent cleanings, closer monitoring of how tissue is healing. Diabetes is a recognized risk factor, and it changes the clinical picture. Our guide to who is at higher risk covers the full list.
Don't wait for symptoms. Early gum disease is essentially painless.2 There's no toothache to warn you, which is exactly why it's often advanced by the time it announces itself. If your gums bleed when you brush or floss, that's information: see what bleeding gums actually mean, and know that stopping your cleaning routine because of blood is the wrong move.
Understand what treatment involves before you're anxious about it. Most gum disease treatment is less dramatic than people expect, and the earlier it's caught the simpler it is. We cover the options in treatment options explained.
Keep the daily habit going regardless. Daily interdental cleaning isn't what the cost study tested, and we won't pretend otherwise. But it is supported on its own evidence: in large national CDC survey data, adults who clean between their teeth regularly have measurably less gum disease,4 and the Cochrane review of clinical trials finds that cleaning between the teeth on top of brushing does reduce gum inflammation, the earliest stage of gum disease.5 If you're managing diabetes, keeping gum inflammation down is a reasonable thing to want.
The honest bottom line
The diabetes link is the sturdiest connection in oral-systemic health: two directions, a plausible shared mechanism in inflammation, and enough consistency that public health agencies state it plainly. It is still not a promise. Treating your gums may help your blood sugar; it will not replace your medication, your diet, or your endocrinologist.
What it can do is remove one inflammatory burden from a body already managing another. For most people that's a couple of minutes a day, a dental appointment you were probably due for anyway, and a conversation between two providers who should have been talking all along.
Common questions
Will treating my gum disease lower my blood sugar?
It may. That is the CDC's own conditional, and we keep it intact.1 The research supports a meaningful and repeatedly observed effect, not a guarantee for any individual person. Treating your gums will not replace your medication, your diet, or your endocrinologist. What it can do is remove one inflammatory burden from a body already managing another.
Does the 40% cost finding apply to flossing at home?
No. The members in that claims study received scaling, root planing, and other clinical care from a dental professional; nothing in the study tested a toothbrush or a floss container.3 It is also a retrospective claims association, not proof that the treatment caused the lower costs, and it measured dollars billed rather than blood sugar readings. We unpack it in treating gum disease and medical costs.
Should I see the dentist more often if I have diabetes?
Tell your dental team about the diagnosis and let them decide. Diabetes is a recognized periodontal risk factor,2 and knowing about it changes the clinical picture: more attentive screening, potentially more frequent cleanings, and closer monitoring of how tissue is healing. Don't wait for symptoms, because early gum disease is essentially painless.2
My gums bleed when I floss. Should I stop?
No. Stopping your cleaning routine because of blood is the wrong move. Bleeding is information about the state of the gums, not a reason to leave the area alone. Mention it to your dental team, and see what bleeding gums actually mean for the full list of causes.
- CDC, Oral Health and Diabetes (2024); Preshaw PM, et al. (2012): gum disease can make diabetes harder to manage; treating gum disease may help lower blood sugar over time. Conditional phrasing is the source's own.
- NIDCR / NIH, Periodontal Disease (2024); StatPearls / NIH, Periodontal Disease (2023): diabetes as a recognized periodontal risk factor; early-stage disease is typically painless.
- Jeffcoat MK, et al. Impact of periodontal therapy on general health. American Journal of Preventive Medicine, 2014 (PMID 24953519). Full text. Retrospective claims-data association across 330,000+ insured members; based on professional periodontal treatment, not home flossing. Not a randomized trial.
- Marchesan JT, et al. Interdental cleaning is associated with decreased oral disease prevalence. Journal of Dental Research, 2018. PMC6728587. Observational, self-reported cleaning frequency.
- Worthington HV, et al. Home use of interdental cleaning devices, in addition to toothbrushing, for preventing and controlling periodontal diseases and dental caries. Cochrane Database of Systematic Reviews, CD012018 (2019). Certainty of evidence: low to very low.